Updated

Authorities said five students who had contact with a man diagnosed with Ebola in Dallas are being monitored but are showing no symptoms of the disease.

Dallas Independent School District Superintendent Mike Miles said Wednesday that the students were in school this week after possibly being in contact with the male patient, identified as Thomas Eric Duncan, over the weekend.

Miles said the students are showing no symptoms and are now being monitored at home. Health officials said the disease is only spread by people with symptoms, such as diarrhea or vomiting.

As an added precaution, Miles said additional health and custodial staff will be at the five schools the students attend.

Duncan has been in isolation at Texas Health Presbyterian Hospital in Dallas since Sunday, after initially being sent home with antibiotics Friday.

Blood tests by Texas health officials and the Centers for Disease Control and Prevention (CDC) separately confirmed his Ebola diagnosis Tuesday.

Duncan is the first person to be diagnosed with Ebola in the U.S. and was listed in serious condition Wednesday.

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